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woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
woom 4
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Bike  20" • 7,6 kg
Child  6 - 8 years • 115 - 130 cm
€ 399,-
Preorder now. Lieferfrist: 07.09.2018

The intro to gears!

The woom 4 is very dynamic. The next step is shifting; all 8 gears greatly expand the bike's range of application. Whether in the woods or on the hill, kids can now explore lots more – beyond their horizons!

Size: 20"
Weight: 7,6 kg (without Pedals)
Age: 6 - 8 years
Height: 115-130 cm
Available Editions:
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The Highlights at a Glance!
These are the most important features
for kids this age...
Woom 3
All components that are specifically designed with safety in mind have the kidsafe PLUS seal. Click the icons to find out more.

“There is much more to riding a bike than just the fun of taking it for a spin: exploring the world means broadening horizons.”

Christian Bezdeka
Founder of woom

Bike geometry

  • A Tire/Wheel 20 Zoll
  • B Cockpit/Handlebar Reach 745 mm (29.33")
  • C Steering Angle 68°
  • D Top Tube Horizontal 430 mm (16.93")
  • E Wheelbase 825 mm (32.48")
  • F Seat Tube Angle 71.5°
  • G Minimum Saddle Height 550 mm (21.65")
  • H Maximum Saddle Height 700 mm (27.56")
  • I Crankarm Length 110 mm (4.33")


  • frame material: light, high quality Aluminum alloy 6061 with seamless tubes
  • 20" wheels and easy handling: low entry and very low sitting position, a long wheel base forgiving steering geometry to provide good balance and thus more riding fun
  • light unicrown fork made out of aluminum
  • 1” shaft
  • self-aligning for easy stearing
  • semi-integrated 1” headset
  • sealed ahead steerer made of steel and aluminum
  • intergrated ahead clamp
  • forged aluminum
  • 40 mm / +10°
  • “knee-friendly”: no protruding bolts thanks to the integrated handlebar clamp design
  • screwed onto handlebarswith two 6 mm hex bolts
  • wide, ergonomic and lightweigt with a slight rise for more control
  • sandblasted / black anodized
  • 560 mm width
  • reduced diameter suitable for tiny hands
  • non-toxic
  • screw in bar end plugs
  • light, forged 110 mm aluminum cranks with a narrow Q-factor (width between the pedals)
  • beginner gearing: 29 x 11-32T
  • plastic platform pedals
  • sealed cartridge
  • mini V-brakes
  • 2 brake levers with reach adjustability to fit small hands
  • high-quality Jagwire cables for reduced friction and smooth performance
  • 8-speed
  • SRAM grip shifters
  • SRAM X4 derailleur
  • ultralight Soopa-Doopa-Hoops aluminium rims
  • aluminum hubs with sealed bearings
  • quick-releases to install and remove wheels
  • 20 x 1.8 mm stainless spokes/ 2x laced
  • Kenda Small Block 1.5” x 20 tires provide good absorption, low rolling resistance and a lot of grip
  • custom 60 TPI
  • schrader valve to easily inflate at any gas station
  • age-specific ergonomic design
  • non-toxic
  • additional added protection to lean on walls
Seat Post
anodized aluminum post withinsertion marks that indicate minimal and maximal insertion depths
Seat Post Clamp
  • aluminum / quick-release
  • long lever that is easy to use
  • does not twist when tightened
Enclosed Tools
  • 1 x 6 mm hex key (stem)
  • 15 mm pedal spanner
7,6 kg (without Pedals)
woom red, sky blue, woom green, purple haze, sunny yellow
Shipping Dimensions
102 x 56 x 23 cm
Weight limit
70 kg

This is how we deliver your bike —
5 min., ready, go!

Any questions regarding assembly?
We're glad to help you out anytime!

assembly instructions pdf, 6 MB


woom bikes grow with you

Kids grow fast but we still want your child to have a bike with the correct size, and, that you don't have to pay more than a compromise. For this reason, we came up with the upCYCLING system.

  • Exchange your old bike and recieve a 40% reimbursement for it when buying the next size up
  • Lifetime upCYCLING membership (you only pay once)
  • The bike must be roadworthy
  • We'll organize the return shipping on your old bike at no cost


Customer Reviews

Based on 11 reviews Write a review
das Superleichte
Reasonable Shipping Costs
We offer shipping all throughout Europe for €10. If you only order accessories, shipping costs €5.
das Durchdachte
Quick delivery
We ship within 24 hours after payment has been received. Your bike will be delivered to your door within 1-4 working days.
das Passende
30 day money-back guarantee
Take some time to test your bike. You can return your bike within 30 days and we'll cover all of the shipping costs.
Unpack and setup
With just a few easy steps your bike will be ready to ride. Get tips in our videos on setting up.
garantierte Qualität
Personal service
We guarantee personal support when you buy a woom bike – satisfaction guaranteed!
Climate protection
We are partners of the klimaaktiv mobil project to help the environment by obliging to use ressources efficiently.